Blend Analysis
The quantitative chemical analysis of linen blend textiles separates and measures the proportion of flax and other fibers in a yarn sample. Utilizing the ISO 1833-11 dissolution assay allows laboratories to verify the purity of blended linen yarns. This standardized test provides the primary means of ensuring that the material ratios match the product description.
Chemical Extraction
Laboratory technicians treat the blended yarn with a concentrated sulfuric acid solution under controlled temperature conditions to dissolve the cotton or regenerated fibers. The insoluble flax residue is then collected, washed, dried, and weighed to determine its dry mass percentage. Since the flax fibers resist this specific acid concentration, the remaining mass represents the true linen content.
This procedure requires precise measurement of both the starting sample and the recovered residue.
Traceability Certification
The results of the laboratory test are recorded in the fiber composition report, which is required for customs clearance and export documentation. If the linen content deviates from the contract specification by more than the allowed tolerance, the mill must re-label the goods or face contractual penalties. Compliance with the ISO 1833-11 dissolution assay guarantees that the fabric meets international trade standards and consumer labeling laws.
By providing an indisputable chemical verification, the assay protects the mill from false claims of adulteration. It serves as the basis for the certificate of origin and blend compliance.
